A method for producing a three-dimensional porous transition alumina catalyst monolith of stacked catalyst fibers, comprising:
a) Preparing a paste in a liquid diluent of hydroxide precursor particles and/or oxyhydroxide precursor particles of transition alumina particles, all particles in the suspension having a number average particle size in the range of from 0.05 to 700 μm,
b) extruding the paste nozzle(s) to form fibers, and depositing the extruded fibers to form a three-dimensional porous catalyst monolith precursor,
c) drying the precursor to remove the liquid diluent,
d) performing a temperature treatment of the dried porous catalyst monolith precursor to form the transition alumina catalyst monolith,
wherein no temperature treatment of the porous catalyst monolith precursor or porous catalyst monolith at temperatures above 1000° C. is performed and wherein no further catalytically active metals, metal oxides or metal compounds are applied to the surface.